* It's a personal or local term: Someone might use "Ruby haircut" to describe a style associated with a person named Ruby, or a particular style popular in a specific community.
* It's a misspelling or misunderstanding: It might be a variation of a more common hairstyle name.
* It's a very niche or newly coined term: It's possible it's a term used in a small circle of stylists or clients.
If you have more context about where you heard this term, it might help narrow down what it could mean. For example:
* Where did you hear about the "Ruby haircut"? (e.g., a specific salon, a social media post)
* Can you describe the hairstyle that was being referred to? (e.g., length, layers, bangs)
With more information, I might be able to help you figure out what the "Ruby haircut" could be.